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<html lang="en">

<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, user-scalable=no">
  <title>Prudential HR agent</title>
</head>

<body>
  <script>
    ; (function anonymous() {
      function computed() {
        let HTML = document.documentElement,
          winW = HTML.clientWidth,
          desW = 750;
        if (winW >= desW) {
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        }
        HTML.style.fontSize = winW / 750 * 100 + 'px';
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      computed();
      window.addEventListener('resize', computed, false);
    })();
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  <div id="root"></div>
</body>

</html>